Machine for making corner-bead blanks.



N. E. CLARK.

MACHINE FOR MAKING CORNER BE AD BLANKS.

' APPLICATION FILED SEPT. 29, I914- Patented June 8,1915.

3 SHEETS SHEET I.

Fig--31.-

WITNESSES h N. E. CLARK. MACHINE FOR MAKING CORNER BEAD BLANKS.

APPLICATION FILED SEPT- 29, i914- -Patented June 8, 1915.

' 3 SHEE TSSHEET,2-

WITNESSES INVENTOR N. E. CLARK.

MACHINE FOR MAKING CORNER BEAD BLANKS. APPLICATION FILED SEPT. 29, I914.

- 1,142,493. Patented June 8, 1915.

j v 3 SHEETS-SHEET}- Fig- 8- v WITNESSES nonn'is ELMORE CLARK,oF'PLAmvILLE; CONNECTICUT.

MACHINE FOR MAKING CORNER-BE AD BLANKS.

Specification of Letters Patent.

Patented June 8, 1915'.

Application filed September 29, 1914. Serial No. 864,041.

To all whom it may concern:

Be ,it known that I, NoRnIs ELMORE' CLARK, a citizen of the UnitedStates of America, and residing at Plainville, in the county of Hartfordand State of C-onnecti cut, haveinvented new and useful Improvements inMachines for Making Corner-.Bead

' Blanks, .&c., of which the following is a specification.

Structures known as corner beads are commonly employed at the corners ofwalls, arches, windowand door 0 enings and the like and they consist ofthe body or bead proper and the attaching arms or wings. The arms orwings which are sometimes integ'ral with the body and sometimes consistof clips secured to the rear or sides of the body serve to hold the bodywith its outer edge spaced away from the foundation. When in use theentire structure except the outer edge is usually embedded in theplaster or cement of the post or wall. The head not only affords astraight edge for the plaster to work to, but it constitutes a rigidprotection to the exposed corner.

In the past it has been customary to make corner beads of sheet iron orsteel and as this material rusts or corrodes very badly when exposed toordinary atmospheric conditions, it is necessary to protect it in someway. The corner bead is therefor usually protected by hot or coldgalvanizing or sherardizing. Owing to the many openings, channels andpockets in the structure it takes up a relatively lar'ge'amount of thezinc or spelter' in hot galvanizing which makes this process veryexpensive. Electroplating or cold galvanizing as it is called is alsoexpensive and requires expensive apparatus and skilful attention and isnot satisfactory. The thin metal of the bead is also liable to be eatenthrough or weakened by the plating solutions. Sherardizing is s alsoexpensive when properly done and there is great danger of burning thethin metal unless great care is taken in the process. If the bead ismade from previously plated stock-the plating flakes off or cracks whenforming the bent edge in the. usual way, and it has to be re-coated.Paint is not permanent and is not at all approved for suchconstructions. None of these methods are really permanent when practisedin the commercially practical way.

- I have discovered an exceedingly simple and inexpensive method ofproviding a much superior finish and appearance to the edge of the beadand protecting it permanently. Only the mechanism is' claimed herein.

According to my invention the main protection is alforde by means of astripflof non-corrosive metal such as pure zinc or zinc-foil securedaround the edge of the body of the bead so as to constitute the outersurfaceor exposed edge when the head is in place in the plaster. In manycases it is unnecessary to coat the arms, wings or clips which attachthe bead proper to the corner post or other support as those portionsare entirely embedded in the plaster when in use and the lime in theplaster acts as a preservative. A better grade but somewhat moreexpensive product may be made by using galvanized stock and applying thezinc strip outside of this for the edge portion. In this way theattaching arms or Wings are protected by the galvanizing and the stripgives a double protection to the most exposed portion of the bead. Thesteel oriron stock should be'heavy enough to furnish practically all ofthe necessary strength be applied smoothly and securely so that it,

will look Well and will remain secure under the usual conditions ofshipment and use. I have found that this may be readily done by formingtangsat the edges of the protective strip, inserting these :tangsinslots in a strip of the flat bead stock and bendlng the ends under;The bead stock 1s then folded to form the desired shaped nose or edgewith the protective strip stretched across its outer face. The foldingof the stock may be accomplished in any suitable manner for instance, asset forth in my application #698,078, filed May 17th, 1912 and in myPatent #1,129, l5etdated Feb. 23, 1915. 7

As the practicability of, any method of 119 protection depends largelyupon its cost, if

t have sought to carry out my improved meth- 0d by simple and reliableautomatic means capable of operation at high speed and requiring littleattention; The iron or steel stock is fed into a machine and perforatedo r slotted at intervals. The narrow protect1ve strip is fed into themachine through the perforating punch and tangs arestamped at its edgesand inserted into the perforations in the stock. As the stock and stripare drawn along the tangs are bent un der. The stock and strip are thenfolded or bent to provide the desired form of nose or edge and the.desired type of arms or wings,

' or clips may be attached.

Details of the 'product and the, method and machines'for manufacturingwill be un- -derst'oodifroni the following specification.

and claims and the accompanying drawings. Figure 1 is a diagrammaticside view and partial section showing the steps of the processofsecurin'g the protecting strip to the stock. Fig. 2, 1s a side view ofthe toolsnecessary for perforating the stock, forming and inserting thetangs and clenching them. Fig; 3, is a transverse vertical sectionalview showing the tools for perforating the stock. Fig. 4, is atransverse vertical sectional view showing the tools for forming thetan'gs on the protecting strip. I

' Fig. 5,-is a transverse vertical sectional'view showingthe gages forthe stock and] the means for clenching the tangs. Fig. 6, is atransverse vertical sectional view showing the finalclen'ching, of thetangs. Fig.- 7, is

a fragmentaryplan View showing parts of the punch" and die mechanism,the gages5-the tang bending plate and parts of the stock and the strip1n the process of treatment. Fig. 8; is a bottom view of a fragment ofthe stockandprotecting strip showing the perforations and the tangs, onetang being bent over or clenched and the other in its position beforeclenching. Fig. 9, is a perspective view of a: fragment of a corner beadembodying my improvedprotecting means.

-Fig. 10, isa fragmentary perspective view of another: form of cornerbead-protected according to myinvention. Fig. 11, a fragmentarysectional'view showing the tools for attaching a protecting strip in asomewhat different manner from the method of Figsll to 8 inclusive.Figs-12, 13 and 14 are fragmentary perspective views of other formsof-corner bead with a protecting strip embodying my invention. ;Fig.'

special set of tools in an'ordinary autcn'natic continuously operatingreciprecating press menses a double roll feed. One pair of rolls 24feeds .in the lengths of the base or body stockand the other pair ofrolls 25 draws or feeds out the product. In the drawings the thicknessof the body stock and the protecting strip and particularly the latter,is very much exaggerated on account of the dimculty of showing it'in itscorrect proportions.

The perforations or slots 26, 26 in the body stock are formed in pairson opposite sides of the center line X-X and the ends 27, 27 are rounded(see Fig. 8). The tangs 28, 28 are formed 1n corresponding pairs at theedges of the protecting-strip and are tapered or inclined on their edgesas at 29, 29. The spacing is such that the tangs are insertedsubstantially in the centers of the slots so that the inclined edges aredrawn over the rounded ends of the slots when the tangs are bent over orclenched. This constitutes a somewhat yielding or loose connectionbetween the strip and the body stock "so that when the stock is bent toform the bull nose or other shaped edge as in Figs. 9 and 10, the stripmay be stretched smooth and tight over the edge without pulling out thetangs. g

The die 30 for each slot is in two parts as shown in Fig. 3 and theopening 31 is tapered to facilitate discharge of the punchings. Eachpunch 32 hasa large cylindrical body 33 which is slotted at 34 toprovide a guide passage. for the protecting strip 20. The unches aremade very short and have a relatively short'stroke' so as to operate athigh speed without breaking. The punch block 35 is guided onthe posts36,36 and pulled up by the rod 37 and forced down by the abutment 38.Themain part of the gate or'punch carrier thus-hasa longer stroke thanthe punches 3 2, 32. The punch block 35vis only raised sufiicientlytoclearthe punches shown-in'Fig. 3. The stock is held down, and-strippedfrom the punches by the plate 39 and the punchblock 35 is recessed at 40for the stripper 39. The stock is guided by rotary gages 41 which may belaterally adjustable as indicated in Figs. 5 and 6. One of them may bepressed'bya spring 42 toward the other to allow forslight variations inwidth of stock. The holders 43 may have slots 44 for the clamp bolts 45to permit lateral movement. 7

The tang die 49 is supported above the body stock which feeds throughthe passage 50 under-it. Each tang'opening'51 is substantially ftriangular. having two cutting edges 52 and 53- and' a bending -shoulderor edge 54 and a slot 55exte'nding parallel to the shoulder and thedirectionfof feed of the strip lEaoh punch 56' is correspond- .inglytriangular in' c'ross section with" two cutting edges 57 andts and 'abenddownward so that the tangs 28 enter the slots 26 in the body stock.As the stock is fed forward the tangs are bent over by the inclinedshoulder 63 as in 5 and clenched against the under side .of the stock asin Fig. 6. The plate 64: forced down by the spring 65serves as a presserto hold the strip against the stock andthus assist the assemblingoperation. The rolls 25 pull forward-the united stock and strip and mayserve to give additional closing or clenching pressure to the tangs.

The body stock with the attached protecting strip is then bent or formedto provide the desired shaped edge or nose. The form shown in Fig. 9 iswhat is known as a bull nose body. The attaching arms or fingers 70, areformed by cutting and bending out' parts of the sides and the arms areunited by side wires 71, 71.

In the form shown in Fig. 10 the sides arev bent laterally to formattaching arms or wings 72, 72 with perforations 7 3' for the plaster. I

Fig. 11 illustrates a difi'erent form of mechanism for" attaching theprotecting strip 75 to a. previously formed bull nose bead 76. The stripis supported on a die 77 having a channel 78. The bead is moved downwardand forces the strip 75 into the channel 78 thus bending the strip intothe dotted position, The side formers 79, 79'

are then moved inward so as to bend the edges of the strip against thesides of the bead. The formers may be provided with points 80 atintervals for punching parts of the strip into the sides of the bead andthus making their union'more secure.

Fig. 12 illustrates such a bead with the protecting strip 75 indented at81 into the body of the bead 76." This form is shown as having attachingarms 82 of wire.

Fig. 13 shows a bead 85 of T-form wit] the protecting strip 86 havingits edges 87 folded around the sides of the bead. This form isparticularly adapted to be supported by separate arms or clips such as88.

In the form shown in Fig. 14 the head has a broad nose 90 and theprotecting strip 91 has its edges 92 bent beneath the sides of the nose.In these two latter forms the edges may be more securely attached byWelding or the like.

ln all forms of the device as shown and dcscribccLit will be noted thatthe edges of the protecting strip are in position to be completelycovered by the plaster when tangs.

in use on a corner 94 as shown in Fig. 15 thus-preventingthe strip frombeing disengaged. This also shows how the entire structure except theprotected outer edge or nose is completely enveloped when erected.Products such as shown in Figs. 9, 10 and 14 are particularly desirablewhen made of previously plated or galvanized stock and provided with theprotecting strip before bending. This strip in fact actually to a largeextent prevents the plating from scaling or cracking when bending thestock into the bead form so that the bead is better qualified towithstand corrosion even after the strip is removed. The protectingstrip affords a much better finish than the ordinary galvanizing andconstitutes a perfect protection against corrosion under the conditionsof ordinary use.

What I claim is 1. In a machine for making corner bead blanks, a supportfor a sheet metal body strip, edge-engaging and smoothing rolls at thesides thereofhaving grooves with inclined walls affording convergingedge-engaging surfaces substantially in the plane of the edges of thestrip for smoothing the edges without bending the strip, means fordirecting a relatively 7 narrow protecting strip midway between theedges of the body strip and means for joining the edges of saidprotecting strip to portions of'the body strip on opposite sides of. thecenter line thereof between the edges of the body strip.

2. In a machinefor-making metallic corner beads, guides for the stock,punches for forming small perforations in the stock, means for supplyinga thin protecting strip, cutters for forming tangs at the edges of thestrip, means for inserting the tangs in the perforations, and means forbending the 3. In a machine for making metallic corner beads, guides forthe stock punches for forming small perforations in the stock, means forsu plying a thin protecting strip, cutters for the strip and means fordeflecting the strip toward the stock.

4. In a machine formaking corner bead blanks, means for formingopeningsin a strip of body stock at intervals along its length on opposite sidesof its center line, -means for supplying a relatively thin and narrowprotecting strip, means for inserting portions of the oppositeedges ofsaid protecting strip into the openings in said body stock on oppositesides of the center line and meansfor clenching said portions.

5. In a corner bead machine, means for inserting the tangs of aprotecting strip in the holes of the stock, stationary inclinedshoulders and means for drawing the stock and strip along so as to forcesaid tangs against said-shoulders.

orming tangs at the edges of a corner bead machine, punch and die embersfor perforating metal stock,

means for guiding a thin strip above said punch member, punch and diecuttersfor forming tangs in said strip, and means for directing saidstrip toward said stock to insert said tangs in the perforations.

' 7. In a corner bead machine, punch and die members for perforatingmetal stock,

1 means for guiding a thin strip above said punch member, punch and diecutters for forming tangs in said strip, and means for directing saidstrip toward said stock to insert said tangs in the perforations, and

means for bending said tangs.

8. In a corner bead machine, a bed having die openings and die cutters,a reciprocating head having punches for registering with :said openingsto form perforations in the ,'220 stock and punch cutters co-acting withsaid die cutters te form tangs in a protecting gs'trip, said bed havingguide passages for said stock and said head having a guide passage forthe protecting strip.

" .s 9. In a corner bead machine, a bed having 'di'e openings and diecutters, a reciprocating head. having punches for registering with saidopenings to. form perforationsin the stock and punch cutters co-actingwith said 80 die' cutters to form tangs in a protecting fstrip, said bedhaving guide passages for said stock andsaid head having a guidepassage-for the protecting strip and means for securing said tangs insaid perforations.

10. lln a corner bead machine a guide for aperforated stock, a cutterdie above said guide, a punch cutter reciprocable above said die forforming in co-action therewith downwardly projecting tangs. in a strip,

I 0 means for. directing said strip toward said stock and inserting saidtangs in the perforations in said stock and means for bending -saidtangs for interlocking said strip and stock.

11. In a machine for making corner bead blanks, .means for feeding bodystock, punch and-dig'members for forming openings in .;,said stock onopposite sides of the center line thereof at intervals along its length,

5 means. for guiding a relatively thin and narrow protecting strip,means for inserting ;portions of said strip through said openingszen-opposite sides of the-center and means for clenching the portions soinserted. V

12. In a machine for making corner bead blanks, punch and die membersfor forming the stoc 'forated stoc beneath said die for a punch and aslot extending from one edge of said opening in the direction of feedand a punch. for cotiperating with said die and cutting and bending atang into said opening. I

14. Mechanism comprisinga .die havinga bending shoulder, two cuttingedges extending transversely to said shoulder, an opening bounded bysaid shoulder and said edges and a .slot extending from said bendingshoulder, a punch having, cutting edges and 'a bending shoulder forcooperating with said die edges and shoulder for cutting a tang andbending it down into said opening and means for feeding stock so thatsaid tang will pass from said opening through said slot.

- 15. Mechanism comprising a die having two openings and two parallelslots, one extending from one edge of each opening, punches for formingand bending tangs into said openings and means for feeding stock in adirection parallel to said slots.

16. Mechanism comprising a die having parallel shoulders and slotscontinuing therefrom in the. direction of feed and cutting edgesextending transverse to said shoulders and punches having shoulders andcutting edges cooperating with said die shoulders and edges for cuttingand bending tan 1%? Mechanism comprising .a die plate having twoopenings of substantially triangular cross section with parallel slotsextending therefrom, punches of substantially triangular sectioncoacting with said die openings to force tangs thereinto, said slotspermitting the feed of the tangs. without lifting.

18. Mechanism comprising a die plate with a die opening having a slotextending therefrom parallel to the direction of feed of the stock, apunch for forcing a tang into said opening and a stripper holding thestock against said die plate so that the tang will travel in the slot.

19. Mechanism comprising a die plate having a tang opening and a slotextending therefrom, a punch for forcing a tang into said opening, meansfor holding the stock down against-the die plate and means beneath thestock for bending the tang as the stock is fed along. 1

20. Mechanism comprising a die plate having a tang opening dud a slotextending therefrom, a punch for forcing a tang into said opening, meansforholding the stock down ag inst the die plate, means beneath .forbending the tang as the stock and means for feeding per-' plate for reisfed alon ceivingfisaid tangs,

, echanism comprising punch and die members for perforating a strip ofmetal,

lateral gages for the strip, and punch and die members for forming tangson a second strip, said perforating die forming a movable guide for saidsecond strip. 7 22. Mechanism comprising a support for perforated stock,a bending shoulder beneath the stock, guides for directinga strip havingtangs toward saidstock and inserting the tangs invthe perforations,means for holding the strip and stock together and means for drawing thestock and strip forward and thereby bending said tangs over saidshoulder.

23. In a machine for making corner bead blanks, means for guiding astrip vof body stock, means for guiding a strip of re1a-'15-' tivelythin and narrow protecting material in line with the center of said bodystock, means'for securing portions of the edges of said protecting stripat intervals to said body strip along opposite sides of the center 20 pline thereof between the edges and leaving the-edges of the body stockfree and means for feeding out the product.

